초록 ▼

An electric system for an electric vehicle includes a voltage type inverter that receives dc input voltage from a dc input circuit, and generates variable ac voltage of a variable frequency, and an ac motor including a plurality of windings each of which has one end connected to an ac output termina

An electric system for an electric vehicle includes a voltage type inverter that receives dc input voltage from a dc input circuit, and generates variable ac voltage of a variable frequency, and an ac motor including a plurality of windings each of which has one end connected to an ac output terminal of the voltage type inverter, the other ends of the windings being connected together to provide a neutral point of motor windings. A variable-voltage energy storage element is connected between the neutral point and a connecting point provided in the dc input circuit, and an on-vehicle dc power supply is connected to the opposite ends of the energy storage element or input terminals of the dc input circuit. The inverter performs switching operations in a zero-voltage vector mode, to operate as a chopper, so that power is transferred between the variable-voltage energy storage element, and the dc input side of the inverter.

대표청구항 ▼

[ What is claimed is:] [1.] An electric system for an electric vehicle, comprising:a dc input circuit;a voltage type inverter that is connected to said dc input circuit to receive input voltage from said dc input circuit, and generate variable ac voltage of a variable frequency;an ac motor including

[ What is claimed is:] [1.] An electric system for an electric vehicle, comprising:a dc input circuit;a voltage type inverter that is connected to said dc input circuit to receive input voltage from said dc input circuit, and generate variable ac voltage of a variable frequency;an ac motor including a plurality of windings each of which has one end connected to an ac output terminal of said voltage type inverter, the other ends of said windings being connected together to provide a neutral point of motor windings;a variable-voltage energy storage element connected between said neutral point and a connecting point provided in said dc input circuit; andan on-vehicle dc power supply connected to opposite ends of said variable-voltage energy storage element.